<template>
  <div v-if="easyFlowVisible" style="height: calc(100vh);">
    <el-row>
      <!--顶部工具菜单-->
      <el-col :span="8">
        <div class="ef-tooltar">
          <el-button type="text" :underline="false">{{ rulesEngineName }}</el-button>
          <el-divider direction="vertical"></el-divider>
          <el-button type="text" icon="el-icon-delete" size="large" @click="deleteElement"
                     :disabled="!this.activeElement.type"></el-button>
          <el-divider direction="vertical"></el-divider>
          <el-button type="text" icon="el-icon-download" size="large" @click="downloadData"></el-button>
          <el-divider direction="vertical"></el-divider>
          <el-button type="text" icon="el-icon-plus" size="large" @click="zoomAdd"></el-button>
          <el-divider direction="vertical"></el-divider>
          <el-button type="text" icon="el-icon-minus" size="large" @click="zoomSub"></el-button>
        </div>
      </el-col>
      <el-col :span="8">
        <div class="ef-tooltar text-center text-hidden">
          {{ rulesEngineDescription }}
        </div>
      </el-col>
      <el-col :span="8">
        <div class="ef-tooltar">
          <div style="float: right;margin-right: 5px">
            <el-button type="info" plain round icon="el-icon-document" @click="dataInfo" size="mini">流程信息</el-button>
            <el-button type="info" plain round icon="el-icon-document" @click="openHelp" size="mini">帮助</el-button>
            <el-button type="primary" plain round icon="el-icon-finished" @click="changeSelfEngineExpansionConfig"
                       size="mini">保存修改
            </el-button>
            <el-button type="warning" plain round icon="el-icon-s-promotion" @click="openHelp" size="mini">发布
            </el-button>
          </div>
        </div>
      </el-col>
    </el-row>
    <div style="display: flex;height: calc(100% - 47px);">
      <div style="width: 230px;border-right: 1px solid #dce3e8;">
        <node-menu @addNode="addNode" ref="nodeMenu"></node-menu>
      </div>
      <div id="efContainer" ref="efContainer" class="container" v-flowDrag>
        <template v-for="node in flowData.nodeList" :key="node.id">
          <flow-node
            :id="node.id"
            :node="node"
            :activeElement="activeElement"
            @changeNodeSite="changeNodeSite"
            @nodeRightMenu="nodeRightMenu"
            @clickNode="clickNode"
          >
          </flow-node>
        </template>
        <!-- 给画布一个默认的宽度和高度 -->
        <div style="position:absolute;top: 2000px;left: 2000px;">&nbsp;</div>
      </div>
      <!-- 右侧表单 -->
      <div style="width: 300px;border-left: 1px solid #dce3e8;background-color: #FBFBFB">
        <flow-node-form ref="nodeForm" @setLineLabel="setLineLabel" :baseRules="baseRules"
                        @repaintEverything="repaintEverything"></flow-node-form>
      </div>
    </div>
    <!-- 流程数据详情 -->
    <flow-info v-if="flowInfoVisible" ref="flowInfo" :data="flowData"></flow-info>
    <flow-help v-if="flowHelpVisible" ref="flowHelp"></flow-help>
  </div>

</template>

<script>
import {VueDraggableNext} from 'vue-draggable-next'
// import { jsPlumb } from 'jsplumb'
// 使用修改后的jsplumb
import './jsplumb'
import {easyFlowMixin} from '@/components/ef/mixins'
import flowNode from '@/components/ef/node.vue'
import nodeMenu from '@/components/ef/node_menu.vue'
import FlowInfo from '@/components/ef/info.vue'
import FlowHelp from '@/components/ef/help.vue'
import FlowNodeForm from './node_form.vue'
import lodash from 'lodash'
import {getRulesEngineConfig} from '@/api/engine/rulesEngineConfig'
import {fetchBaseRuleConfig} from "@/api/engine/rulesRuleConfig";
import {changeEngineExpansionConfig} from "../../api/engine/rulesEngineConfig";


export default {
  props: {
    rulesEngineId: String,
  },
  data() {
    return {
      rulesEngineName: "",
      rulesEngineDescription: "",
      // jsPlumb 实例
      jsPlumb: null,
      // 控制画布销毁
      easyFlowVisible: true,
      // 控制流程数据显示与隐藏
      flowInfoVisible: false,
      // 是否加载完毕标志位
      loadEasyFlowFinish: false,
      flowHelpVisible: false,
      baseRules: [],
      // 数据
      flowData: {
        id: 0
      },
      // 激活的元素、可能是节点、可能是连线
      activeElement: {
        // 可选值 node 、line
        type: undefined,
        // 节点ID
        nodeId: undefined,
        // 连线ID
        sourceId: undefined,
        targetId: undefined
      },
      zoom: 0.5
    }
  },
  // 一些基础配置移动该文件中
  mixins: [easyFlowMixin],
  components: {
    draggable: VueDraggableNext, flowNode, nodeMenu, FlowInfo, FlowNodeForm, FlowHelp
  },
  directives: {
    'flowDrag': {
      bind(el, binding, vnode, oldNode) {
        if (!binding) {
          return
        }
        el.onmousedown = (e) => {
          if (e.button === 2) {
            // 右键不管
            return
          }
          //  鼠标按下，计算当前原始距离可视区的高度
          let disX = e.clientX
          let disY = e.clientY
          el.style.cursor = 'move'

          document.onmousemove = function (e) {
            // 移动时禁止默认事件
            e.preventDefault()
            const left = e.clientX - disX
            disX = e.clientX
            el.scrollLeft += -left

            const top = e.clientY - disY
            disY = e.clientY
            el.scrollTop += -top
          }

          document.onmouseup = function (e) {
            el.style.cursor = 'auto'
            document.onmousemove = null
            document.onmouseup = null
          }
        }
      }
    }
  },
  mounted() {
    this.jsPlumb = jsPlumb.getInstance()
    this.$nextTick(() => {
      // 默认加载流程A的数据、在这里可以根据具体的业务返回符合流程数据格式的数据即可
      let that = this
      getRulesEngineConfig(that.rulesEngineId).then(response => {

        let expansionConfigStr = response.data.expansionConfig
        let expansionConfig = {
          nodeList: [],
          lineList: []
        }

        if (expansionConfigStr !== null && expansionConfigStr.trim() !== '') {
          // 不为空，转 JSON
          let expansionConfigJSON = JSON.parse(expansionConfigStr)
          let expansionConfigJSONElement = expansionConfigJSON['nodeList']
          if (expansionConfigJSONElement !== null) {
            expansionConfig.nodeList = expansionConfigJSONElement
          }
          let expansionConfigJSONLineElement = expansionConfigJSON['lineList']
          if (expansionConfigJSONLineElement !== null) {
            expansionConfig.lineList = expansionConfigJSONLineElement
          }
        }

        this.rulesEngineName = response.data.name
        this.rulesEngineDescription = response.data.description

        let flowData = {
          nodeList: expansionConfig.nodeList,
          lineList: expansionConfig.lineList,
        }
        that.dataReload(flowData)
      })
    })
    fetchBaseRuleConfig(1, 1_000_000_000).then(response => {
      this.baseRules = response.data.dataList
    })
  },
  methods: {
    changeSelfEngineExpansionConfig() {
      changeEngineExpansionConfig(this.rulesEngineId, JSON.stringify(this.flowData)).then(response => {

      })
    },
    // 返回唯一标识
    getUUID() {
      return Math.random().toString(36).substr(3, 10)
    },
    jsPlumbInit() {
      this.jsPlumb.ready(() => {
        // 导入默认配置
        this.jsPlumb.importDefaults(this.jsplumbSetting)
        // 会使整个jsPlumb立即重绘。
        this.jsPlumb.setSuspendDrawing(false, true);
        // 初始化节点
        this.loadEasyFlow()
        // 单点击了连接线, https://www.cnblogs.com/ysx215/p/7615677.html
        this.jsPlumb.bind('click', (conn) => {
          this.activeElement.type = 'line'
          this.activeElement.sourceId = conn.sourceId
          this.activeElement.targetId = conn.targetId
          this.$refs.nodeForm.lineInit({
            from: conn.sourceId,
            to: conn.targetId,
            label: conn.getLabel()
          })
        })
        // 连线
        this.jsPlumb.bind("connection", (evt) => {
          let from = evt.source.id
          let to = evt.target.id
          if (this.loadEasyFlowFinish) {
            this.flowData.lineList.push({from: from, to: to})
          }
        })

        // 删除连线回调
        this.jsPlumb.bind("connectionDetached", (evt) => {
          this.deleteLine(evt.sourceId, evt.targetId)
        })

        // 改变线的连接节点
        this.jsPlumb.bind("connectionMoved", (evt) => {
          this.changeLine(evt.originalSourceId, evt.originalTargetId)
        })

        // 连线右击
        this.jsPlumb.bind("contextmenu", (evt) => {
          console.log('contextmenu', evt)
        })

        // 连线
        this.jsPlumb.bind("beforeDrop", (evt) => {
          let from = evt.sourceId
          let to = evt.targetId
          if (from === to) {
            this.$message.error('节点不支持连接自己')
            return false
          }
          if (this.hasLine(from, to)) {
            this.$message.error('该关系已存在,不允许重复创建')
            return false
          }
          if (this.hashOppositeLine(from, to)) {
            this.$message.error('不支持两个节点之间连线回环');
            return false
          }
          this.$message.success('连接成功')
          return true
        })

        // beforeDetach
        this.jsPlumb.bind("beforeDetach", (evt) => {
          console.log('beforeDetach', evt)
        })
        this.jsPlumb.setContainer(this.$refs.efContainer)
      })
    },
    // 加载流程图
    loadEasyFlow() {
      // 初始化节点
      for (let i = 0; i < this.flowData.nodeList.length; i++) {
        let node = this.flowData.nodeList[i]
        // 设置源点，可以拖出线连接其他节点
        this.jsPlumb.makeSource(node.id, lodash.merge(this.jsplumbSourceOptions, {}))
        // // 设置目标点，其他源点拖出的线可以连接该节点
        this.jsPlumb.makeTarget(node.id, this.jsplumbTargetOptions)
        if (!node.viewOnly) {
          this.jsPlumb.draggable(node.id, {
            containment: 'parent',
            stop: function (el) {
              // 拖拽节点结束后的对调
              console.log('拖拽结束: ', el)
            }
          })
        }
      }
      // 初始化连线
      for (let i = 0; i < this.flowData.lineList.length; i++) {
        let line = this.flowData.lineList[i]
        let connParam = {
          source: line.from,
          target: line.to,
          label: line.label ? line.label : '',
          connector: line.connector ? line.connector : '',
          anchors: line.anchors ? line.anchors : undefined,
          paintStyle: line.paintStyle ? line.paintStyle : undefined,
        }
        this.jsPlumb.connect(connParam, this.jsplumbConnectOptions)
      }
      this.$nextTick(function () {
        this.loadEasyFlowFinish = true
      })
    },
    // 设置连线条件
    setLineLabel(from, to, label) {
      let conn = this.jsPlumb.getConnections({
        source: from,
        target: to
      })[0]
      if (!label || label === '') {
        conn.removeClass('flowLabel')
        conn.addClass('emptyFlowLabel')
      } else {
        conn.addClass('flowLabel')
      }
      conn.setLabel({
        label: label,
      })
      this.flowData.lineList.forEach(function (line) {
        if (line.from === from && line.to === to) {
          line.label = label
        }
      })

    },
    // 删除激活的元素
    deleteElement() {
      if (this.activeElement.type === 'node') {
        this.deleteNode(this.activeElement.nodeId)
      } else if (this.activeElement.type === 'line') {
        this.$confirm('确定删除所点击的线吗?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          let conn = this.jsPlumb.getConnections({
            source: this.activeElement.sourceId,
            target: this.activeElement.targetId
          })[0]
          this.jsPlumb.deleteConnection(conn)
        }).catch(() => {
        })
      }
    },
    // 删除线
    deleteLine(from, to) {
      this.flowData.lineList = this.flowData.lineList.filter(function (line) {
        return !(line.from === from && line.to === to);
      })
    },
    // 改变连线
    changeLine(oldFrom, oldTo) {
      this.deleteLine(oldFrom, oldTo)
    },
    // 改变节点的位置
    changeNodeSite(data) {
      for (let i = 0; i < this.flowData.nodeList.length; i++) {
        let node = this.flowData.nodeList[i]
        if (node.id === data.nodeId) {
          node.left = data.left
          node.top = data.top
        }
      }
    },
    /**
     * 拖拽结束后添加新的节点
     * @param evt
     * @param nodeMenu 被添加的节点对象
     * @param mousePosition 鼠标拖拽结束的坐标
     */
    addNode(evt, nodeMenu, mousePosition) {
      let screenX = evt.originalEvent.clientX, screenY = evt.originalEvent.clientY
      let efContainer = this.$refs.efContainer
      let containerRect = efContainer.getBoundingClientRect()
      let left = screenX, top = screenY
      // 计算是否拖入到容器中
      if (left < containerRect.x || left > containerRect.width + containerRect.x || top < containerRect.y || containerRect.y > containerRect.y + containerRect.height) {
        this.$message.error("请把节点拖入到画布中")
        return
      }
      left = left - containerRect.x + efContainer.scrollLeft
      top = top - containerRect.y + efContainer.scrollTop
      // 居中
      left -= 85
      top -= 16
      let nodeId = this.getUUID()
      // 动态生成名字
      let origName = nodeMenu.name
      let nodeName = origName
      let index = 1
      while (index < 10000) {
        let repeat = false
        for (let i = 0; i < this.flowData.nodeList.length; i++) {
          let node = this.flowData.nodeList[i]
          if (node.name === nodeName) {
            nodeName = origName + index
            repeat = true
          }
        }
        if (repeat) {
          index++
          continue
        }
        break
      }
      let node = {
        id: nodeId,
        name: nodeName,
        type: nodeMenu.type,
        left: left + 'px',
        top: top + 'px',
        ico: nodeMenu.ico,
        state: 'success',
        maxExecuteTime: 0,
        readOnly: !!nodeMenu.readOnly
      }
      /**
       * 这里可以进行业务判断、是否能够添加该节点
       */
      this.flowData.nodeList.push(node)
      this.$nextTick(function () {
        this.jsPlumb.makeSource(nodeId, this.jsplumbSourceOptions)
        this.jsPlumb.makeTarget(nodeId, this.jsplumbTargetOptions)
        this.jsPlumb.draggable(nodeId, {
          containment: 'parent',
          stop: function (el) {
            // 拖拽节点结束后的对调
            console.log('拖拽结束: ', el)
          }
        })
      })
    },
    /**
     * 删除节点
     * @param nodeId 被删除节点的ID
     */
    deleteNode(nodeId) {
      let nodeName = this.flowData.nodeList.filter(function (node) {
        return node.id === nodeId;
      })[0].name
      this.$confirm(`确定要删除节点 ${nodeName} [${nodeId}]?`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
        closeOnClickModal: false
      }).then(() => {
        /**
         * 这里需要进行业务判断，是否可以删除
         */
        this.flowData.nodeList = this.flowData.nodeList.filter(function (node) {
          return node.id !== nodeId;
        })
        this.$nextTick(function () {
          this.jsPlumb.removeAllEndpoints(nodeId);
        })
      }).catch(() => {
      })
      return true
    },
    clickNode(nodeId) {
      this.activeElement.type = 'node'
      this.activeElement.nodeId = nodeId
      this.$refs.nodeForm.nodeInit(this.flowData, nodeId)
    },
    // 是否具有该线
    hasLine(from, to) {
      for (let i = 0; i < this.flowData.lineList.length; i++) {
        let line = this.flowData.lineList[i]
        if (line.from === from && line.to === to) {
          return true
        }
      }
      return false
    },
    // 是否含有相反的线
    hashOppositeLine(from, to) {
      return this.hasLine(to, from)
    },
    nodeRightMenu(nodeId, evt) {
      this.menu.show = true
      this.menu.curNodeId = nodeId
      this.menu.left = evt.x + 'px'
      this.menu.top = evt.y + 'px'
    },
    repaintEverything() {
      this.jsPlumb.repaint()
    },
    // 流程数据信息
    dataInfo() {
      this.flowInfoVisible = true
      this.$nextTick(function () {
        this.$refs.flowInfo.init()
      })
    },
    // 加载流程图
    dataReload(data) {
      this.easyFlowVisible = false
      this.flowData.nodeList = []
      this.flowData.lineList = []
      this.$nextTick(() => {
        data = lodash.cloneDeep(data)
        this.easyFlowVisible = true
        this.flowData = data
        this.$nextTick(() => {
          this.jsPlumb = jsPlumb.getInstance()
          this.$nextTick(() => {
            this.jsPlumbInit()
          })
        })
      })
    },
    zoomAdd() {
      if (this.zoom >= 1) {
        return
      }
      this.zoom = this.zoom + 0.1
      this.$refs.efContainer.style.transform = `scale(${this.zoom})`
      this.jsPlumb.setZoom(this.zoom)
    },
    zoomSub() {
      if (this.zoom <= 0) {
        return
      }
      this.zoom = this.zoom - 0.1
      this.$refs.efContainer.style.transform = `scale(${this.zoom})`
      this.jsPlumb.setZoom(this.zoom)
    },
    // 下载数据
    downloadData() {
      this.$confirm('确定要下载该流程数据吗？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
        closeOnClickModal: false
      }).then(() => {
        let datastr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(this.flowData, null, '\t'));
        let downloadAnchorNode = document.createElement('a')
        downloadAnchorNode.setAttribute("href", datastr);
        downloadAnchorNode.setAttribute("download", 'data.json')
        downloadAnchorNode.click();
        downloadAnchorNode.remove();
        this.$message.success("正在下载中,请稍后...")
      }).catch(() => {
      })
    },
    openHelp() {
      this.flowHelpVisible = true
      this.$nextTick(function () {
        this.$refs.flowHelp.init()
      })
    }
  }
}
</script>
